Now, as I understand it, and I could be wrong - the cat A system is fitted only because of a noise certification issue, nothing to do with safety, its a lot of work just for 3% Nr. The 145 has an automatic Cat A and I believe works just fine.
Interesting that the upgrade will be free to T2 owners, I didn't think ECD did anything for free!
I have to agree with some of the comments about switchology on the 135, some strange ideas about where to put things.